Basement Waterproofing in Mt. Lebanon, PA
Plenty of basements in Mt. Lebanon, PA were dug long before anyone talked about interior drains, and a hard summer downpour can still find them. Tell this free referral service what you see, and it passes the details to one independent local contractor, who arranges a visit and writes the estimate.
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Fixing Basement Water in Mt. Lebanon, PA
Mt. Lebanon sits about 6 miles southwest of Downtown Pittsburgh and counted 34,075 residents in the 2020 Census. About 72% of homes are owner-occupied, and the median value of $378,300 is the highest of the five towns this site covers. Mail may say Pittsburgh, but the township keeps its own code office and drainage rules.
Think of this site as a switchboard, not a builder. It does no basement work, sets no prices and holds no Pennsylvania home improvement contractor registration. Contractors can advertise here, free during a trial, and the person asking is never billed or given anything.
Tudor, Foursquare and Craftsman Basements
Mt. Lebanon grew up as a streetcar suburb. Its first trolley line opened in 1901, the Liberty Tubes shortened the trip downtown in 1924, and the township incorporated in 1912, adopting home rule in 1975. As of the 2000 Census, about 30% of homes predated 1940 and about 72% predated 1960.
The Mt. Lebanon Historic District counts 3,341 contributing buildings from roughly 1874 to 1945: Colonial Revival, Tudor Revival, Foursquare and Craftsman. Neighborhoods include Virginia Manor, Mission Hills, Beverly Heights, Cedarhurst and Twin Hills. Older stone and block foundations often show water in familiar ways.
- Joints that dust away under a fingertip. Softened mortar between stones gives seepage an easy path.
- A damp band low on the uphill wall. On a sloping lot, the side facing higher ground gets wet first.
- A chalky white bloom after rain. Minerals left as moisture dries show water moving through.
Services in Mt. Lebanon, PA
- Interior drain and sump. New or replaced subfloor drainage needs a township building permit, so the trench stays open until it is inspected.
- Sump pumps. Discharge must land at least 10 feet from property lines, never aimed at the street or a neighbor.
- Downspouts and grading. Roof and area drains may not empty into the sanitary sewer, so water gets turned out into the yard.
- Crack and wall repair. Injection for poured walls, repointing for stone; wall anchors and push piers need a permit.
- Single-spot leaks. A wet patch by a pipe opening or window well can often be fixed alone.
See sump pump installation and basement drainage for more.
Painters Run, Saw Mill Run and Cloudbursts
Painters Run, with a county-listed floodplain, and Saw Mill Run both begin inside the township, though most houses sit well above them.
On June 20, 2018, about 2.5 inches of rain fell within an hour, and basements flooded on Cedar, Racine, Newburn and Twin Hills plus "about a dozen other locations," Mt. Lebanon Magazine reported. The municipal engineer explained that small house pipes can quickly fill an eight-inch sewer main. Since 2012 the township has billed a stormwater fee, only the second in Pennsylvania.
When water comes up through a floor drain, the sewer is the likelier source than the walls. ALCOSAN treats the township's wastewater but says backups belong to the local sewer owner, so tell Public Works at 412-343-3403.
Mt. Lebanon, PA Permits and Dye Tests
All drainage work must be inspected before it is covered. The Inspection Office at 710 Washington Road, 412-343-3408, issues permits, and the contractor confirms which ones a job needs.
Selling triggers Ordinance 3099. A registered Allegheny County plumber dye-tests downspouts, area and driveway drains, and any interior French drain or sump; the seller files at least 10 business days before closing, and a pass lasts 3 years. The verdict is the township's, never a contractor's.
Tying a sump into a drain, adding a backwater valve or fixing a sewer lateral is plumbing, needing a licensed master plumber and an Allegheny County Health Department permit.
Mt. Lebanon, PA Price Ranges
No price list covers Mt. Lebanon alone, so these rows are national.
| Cost row | Figure | Source (year) |
|---|---|---|
| Typical basement waterproofing project | about $3,000 to $10,000 (average about $5,000) | Fixr national (2026) |
| Interior perimeter drain, per linear foot | $40 to $120 | Fixr national (2026) |
| Sump pump installation | $600 to $2,500 | Fixr national (2026) |
| Epoxy crack injection, per crack | $250 to $1,000 | Fixr national (2026) |
| Waterproof paint or sealant, per sq ft | $1 to $8 | Fixr national (2026) |
A pricier house doesn't change what a foot of drain costs, but a bigger footprint means more wall. The cost calculator gives a rough figure.
Local Help, One Request
- An estimate you can measure. Ask for feet of drain, pump model and discharge point, then compare them with township rules.
- A deposit with limits. Above $5,000, state law generally caps the deposit at a third of the price, and money waits until you have signed.
- A warranty that can move. Ask whether it passes to a buyer, useful where drains are tested at every sale.
Your Address, Then the Source of the Water
Check that a contractor serves your street, then use the wet basement checker to see whether the signs point to seepage or the sewer.
Questions About Mt. Lebanon, PA Basements
Will the dye test at sale look at my sump pump?
It can. Under Ordinance 3099, the plumber checks interior French drains and sumps along with downspouts and area and driveway drains. A sump emptying into the sanitary line will likely need rerouting before closing, and Public Works at 412-343-3403 can walk you through the steps.
Where is my sump pump allowed to discharge?
At least 10 feet from any property line, and not toward the street or a neighbor. If the simplest route runs into a drain pipe, that connection counts as plumbing for a licensed master plumber holding an Allegheny County permit, not part of the waterproofing job.
Water came up my floor drain in a cloudburst. Is that a waterproofing problem?
Usually not. It sounds like the overloaded sewer the township engineer described after the 2018 storm. Report it to the township, and ask a licensed master plumber whether a backwater valve fits. Sewer backups are often left out of homeowners policies without a separate endorsement, so check your policy with your agent.
How can I check a contractor's Pennsylvania registration?
It starts with "PA" and belongs on every ad, estimate and contract. Check it with the Attorney General's online Home Improvement Contractor search or the HelpLine, 1-888-520-6680. Because this site never names contractors, that number has to come from the contractor.
Next Door to Mt. Lebanon, PA
East across the South Hills there is a page for Baldwin Borough, PA, and northwest toward Chartiers Creek there is one for Carnegie, PA.
Next Step for Mt. Lebanon, PA Homeowners
Jot down when the water shows up and which wall it favors, then send the request form. One independent contractor working in Mt. Lebanon will be in touch about a visit, and hiring anyone is up to you.